advertising
The listing sites have a small banner above the sponsored listings, as Sponsored
.
Do they need to have it legally?
If not, then why do they do it? Is there any research or argument about whether it helps the sales and/or helps in giving a better signal about the product to the user?
Countries require you to disclose affiliations. In particular the US:
http://www.socialmediaexaminer.com/ftc-2013-disclosures/
http://www.internetlegalattorney.com/when-is-an-affiliate-disclosure-required/
More saliently, if you do not disclose your affiliations, your credibility stands to drop to zero if/when they’re discovered and turn out to be reason for concern. Angry users tend to generate a lot more noise and word of mouth than happy ones. So better play it safe and disclose.
You can do a few thought experiments if you need any convincing of the damage that lack of proper disclosure can do:
For research, honestly no idea off the top of my head. Intuitively, there is, and you’ll likely find it concluding that lying (i.e. no disclosure) works better until you get caught (and you will). Like any form of manipulation, subtle without being pushy works. In this case, so does being an outrageous troll. Once you get caught red handed, your credibility quickly drops to zero. And in today’s world there always will be someone with a grudge who will actively call you out online.
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